<?php
/**
 * MyZendX - My Zend Extensions
 * 
 * Copyright (C) 2011 by Tomasz Ulanowski
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 */

/**
 * 
 * Cascade Select Form Element
 *
 */
class MyZendX_Form_Element_CascadeSelect extends Zend_Form_Element_Select
{
	public $helper = 'formCascadeSelect';
	
	protected $_isArray = true;
	

	public function isValid($value, $context = null)
	{
		if ($this->registerInArrayValidator()) {
			if (!$this->getValidator('InArray')) {
				$multiOptions = $this->getMultiOptions();
				$options      = array();

            	$iterator = new RecursiveIteratorIterator(new RecursiveArrayIterator($multiOptions), RecursiveIteratorIterator::SELF_FIRST);
            	foreach($iterator as $opt_value => $opt_label) {
            		if(!($iterator->getDepth() % 2)) { 
            			$options[] = $opt_value;
            		}
				}

				$this->addValidator(
                    'InArray',
					true,
					array($options)
				);
			}
		}
		return parent::isValid($value, $context);
	}
}